public static ASMInstruction Parse(string str)
{
if (string.IsNullOrEmpty(str))
{
return(null);
}
ASMInstruction instruction = new ASMInstruction();
string[] split = str.Split(' ');
if (split[0][0] == '+')
{
instruction.DoesAdd = true;
instruction.Token = split[0].Substring(1);
}
else
{
instruction.Token = split[0];
}
instruction.Parameter = new ASMParameter[split.Length - 1];
for (int i = 0; i < instruction.Parameter.Length; ++i)
{
instruction.Parameter[i] = ASMParameter.Parse(split[i + 1]);
}
return(instruction);
}
public static ASMParameter Parse(string str)
{
ASMParameter result = new ASMParameter();
switch (str[0])
{
case '*':
result.IsPointer = true;
str = str.Substring(1);
int offsetIndex = str.IndexOf('-');
if (offsetIndex == -1)
{
offsetIndex = str.IndexOf('+');
}
if (offsetIndex == -1)
{
result.Value = int.Parse(str);
}
else
{
result.Value = int.Parse(str.Substring(0, offsetIndex));
result.Offset = int.Parse(str.Substring(offsetIndex));
}
break;
case '@':
result.IsRegister = true;
str = str.Substring(1);
offsetIndex = str.IndexOf('-');
if (offsetIndex == -1)
{
offsetIndex = str.IndexOf('+');
}
if (offsetIndex == -1)
{
result.Value = int.Parse(str);
}
else
{
result.Value = int.Parse(str.Substring(0, offsetIndex));
result.Offset = int.Parse(str.Substring(offsetIndex));
}
break;
default:
result.IsConstant = true;
result.Value = int.Parse(str);
break;
}
return(result);
}
public bool Accepts(ASMParameter param)
{
return((AllowConstant && param.IsConstant) ||
(AllowRegister && param.IsRegister) ||
(AllowPointer && param.IsPointer));
}